Task 14 [C#]

_task_14.cs

using System;
using System.Collections.Generic;

namespace Task14
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime date_now = DateTime.Now;
            DateTime date_birth = new DateTime();

            Console.WriteLine("Enter your birth day:");
            date_birth = DateTime.Parse(Console.ReadLine());

            if (date_birth < date_now)
            {
                DateTime delta = new DateTime((date_now - date_birth).Ticks);
                Console.WriteLine($"Your age is {delta.Year-1} years, {delta.Month-1} months, {delta.Day-1} days.");
            }
            else
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("ERROR: birth date is bigger then now");
                Console.ForegroundColor = ConsoleColor.Gray;
            }
            
            Console.ReadKey();
        }
    }
}

output.txt

C:\AP\Task14>dotnet run
Enter your birth day:
03/11/2021
ERROR: birth date is bigger then now

C:\AP\Task14>dotnet run
Enter your birth day:
02.10.2003
Your age is 16 years, 6 months, 13 days.